Ametallic sphere has a charge of 10 microcolumb. a unut negatuve charge is brought from a to b both 100 cm away from sphere but a being east of it while b being on west the net workdone is

The work done is, W = 0

Explanation:

Given,

The charge of the metallic sphere, Q = 10 μ C

The charge of the test charge, q = -1

The initial position of the unit charge, A = 100 cm

The final position of the unit charge, B = 100 cm

The work done by the unit charge is given by the equation

Where F is the force between two charges

Substituting in the above equation

On integrating for the limit A to B

Substituting the integral values

                                  V = 0

The work done by a unit charge on an electric field from A to B is the difference between the electric potential of the two locations. If the locations are at the same distance from the origin, the work done will be zero.

Hence, the work done by moving a unit negative charge from point A to B is, V = 0

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

it has to be b, about 97 percent.